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A-E Download F-J Download K-O Download P-S Download T-Z Download Abnormal operating conditions
|
General
|
Environmental
conditions that are unfavorable, harmful, or detrimental to
or for the operation of a crane, such as excessively high or
low ambient temperatures, exposure to
adverse weather, corrosive fumes, dust-laden or moisture-laden
atmospheres, and hazardous locations.
(ASME B30.2-1990)
|
Access platform
|
Overhead
Crane
|
A limited
length platform, located on the idler girder to access to the
endtruck wheels only.
|
Adjustable or variable voltage
|
Bridge Crane
Control
|
A method
of Bridge Crane Control by which the motor supply voltage can
be adjusted. (CMAA Spec. 70)
|
Administrative or regulatory authority
|
Regulatory
|
Governmental
agency or, in the absence of governmental jurisdiction, the
employer.
(ASME B30.2-1990)
|
Ambient temperature
|
General
|
The temperature
of the atmosphere surrounding the hoist.
(ASME HST-4M-1991)
|
Ampacity
|
Bridge Crane
Bridge Crane Electrical
|
The current
carrying capacity expressed in amperes. (ANSI MH 27.1-1981)
|
Appointed
|
Regulatory
|
Assigned
specific responsibilities by the employer or the employer’s representative.
(ASME B30-17)
|
Authorized
|
Regulatory
|
Appointed
by a duly constituted administrative or regulatory authority. (ASME
B30-17)
|
Automatic crane
|
Overhead
Crane
|
A crane which
when activated operates through a preset cycle or cycles. (ANSI
MH 27.1-1981)
|
Automatic dispatch carrier
|
Monorail
|
A carrier
which when activated operates through a preset cycle or cycles.
(ANSI MH 27.1-1981)
|
Auxiliary hoist
|
Hoist
|
A supplemental
hoisting unit, usually designed to handle lighter loads at a
higher sped than the main host. (CMAA Spec. 70)
|
Axle, fixed
|
Drive
|
A shaft which
is fixed in the end truck and about which the wheel revolves.
(WCH)
|
Axle, rotating
|
Drive
|
A shaft which
is fixed in the wheel and which rotates on bearings fixed in
the end truck. (WCH)
|
B-10 bearing life
|
General
|
The B-lO
bearing life of an anti-friction bearing is the minimum expected
life, in hours, of 9O~7o of a group of bearings which are operated
at a given speed and loading. (ANSI MH 27.1-1981)
|
Base or deck mounted (hoist)
|
Hoist
|
A type of
mounting where the hoist is mounted to the top side of a horizontal
supporting surface.
(ASME HST-4M-1991)
|
Battery system (backup)
|
Below Hook
Device
|
Batteries
used to guard against inadvertent load release due to loss of
primary power to magnet system.
(ASME B30.20-1985)
|
Beam
|
Overhead
Crane
&
Hoist
|
An overhead
standard structural or specially fabricated shape on which the
trolley operates.
(ASME HST-4M-1991)
|
Bearing life
|
General
|
The L-10
life of an anti-friction bearing is the minimum expected life,
hours, of 90 percent of a group of bearings which are operating-at
a given speed and loading. The average expected life of the bearings
is approximately five times the L-10 life. (CMAA Spec. 70)
|
Bearing, lifetime lubricated
|
General
|
An antifriction
bearing which is provided with seals and a high-stability oxidation-resistant
grease to permit operation of the bearing without re-lubrication
for not less than the specified B-10 life.
|
Below the hook device
|
|
|
BHN
|
General
|
Brinell hardness
number, measurement of material hardness. (CMAA Spec. 70)
|
Block, load
|
Hoist
|
The assembly
of hook, swivel, bearings, sheaves, pins and frame suspended
from the hoisting ropes. In a “short type” block, the hook and
the sheaves are mounted on the same
member, called the swivel. In a “long type” block, the hook and
the sheaves are mounted on separate members. (The supporting member
for the sheaves is called the sheave pin and the supporting member
for the hook is called the trunnion. (WCH)
|
Block, upper
|
Hoist
|
A fixed assembly
of sheaves, bearings, pins and frame, located on the trolley
cross members, and which supports the load block and its load
by means of the ropes. (WCH)
|
Bogie
|
Overhead
Crane
|
A short end
truck attached to the end of one girder (or to a connecting member
if more than one bogie is used per girder). This type of end
truck is used when more than four wheels are required on a crane
due to the design of the runway. (WCH)
|
Bogie, equalizing
|
Hoist
|
A short end
truck which is flexibly connected to one girder (or connecting
member) by means of a pin upon which the truck can oscillate
to equalize the loading on the two
truck wheels. This construction uses a very rigid end tie between
the girders. (WCH)
|
Bogie, fixed
|
Overhead
Crane
|
A short end
truck which is rigidly connected to one girder. A flexible end
tie is used between the girders to permit equalization of the
wheel loads by torsional deflection of the girders and flexing
of the end tie. (WCH)
|
Boom (of gantry cranes)
|
Overhead
Crane
|
An extension
of the trolley runway that may be raised or retracted to obtain
clearance for gantry travel.
(ASME B30.2-1990)
|
Boom (of overhead cranes)
|
Overhead
Crane
|
A horizontal
member mounted on the trolley to permit hoisting and lowering
the load at a point other than directly under the hoist drum
or trolley. (ASME B30.2-1990)
|
Box section
|
Overhead
Crane
|
The rectangular
cross section of girders, trucks or other members enclosed on
four sides. (CMAA Spec. 70)
|
Brake
|
Overhead
Crane
&
Hoist
|
A device,
other than a motor, used for retarding or stopping motion by
friction or power means. (CMAA Spec. 70)
|
Brake, Bridge Crane Control
|
Overhead
Crane
&
Hoist
|
A method
of Bridge Crane Controlling speed by removing energy from the
moving body or by imparting energy in the opposite direction.
(ASME B30-16-1993)
|
Brake, countertorque (plugging)
|
Hoist
|
A method
of Bridge Crane Control by which the power to the motor is reversed
to develop torque in the direction opposite to the rotation
of the motor using the motor as a generator,
with the energy being dissipated by resistance.
(ASME B30-16-1993)
|
Brake, drag
|
Overhead
Crane
&
Hoist
|
A friction
brake that provides a continuous retarding force having no external
Bridge Crane Control.
(ASME B30-17)
|
Brake, dynamic
|
Hoist
|
A method
of Bridge Crane Controlling speed by block, load the assembly
of hook or shackle, swivel. bearing, sheaves, sprockets. pins,
and frame suspended by the hoisting rope or load
chain. This shall include any appurtenances reeved in the hoisting
rope or load chain.
(ASME B30-16-1993)
|
Brake, eddy current
|
Overhead
Crane
&
Hoist
|
A method
of Bridge Crane Controlling or reducing speed by means of an
Bridge Crane Electrical induction load brake.
(ASME B30-17)
|
Brake, emergency
|
Overhead
Crane
|
A method
of decelerating a drive when power is not available. The braking
effort may be established as a result of action by the operator,
or automatically when power to the drive is interrupted.(ASME
B30-17)
|
Brake, holding
|
Overhead
Crane
&
Hoist
|
A friction
brake for a hoist that is automatically applied and prevents
motion when power to the brake is off.
(ASME B30.2-1990)
|
Brake, hydraulic
|
Overhead
Crane
|
A method
of Bridge Crane Controlling or reducing speed by means of displacement
of a liquid. (ASME B30-17)
|
Brake, mechanical
|
Overhead
Crane
&
Hoist
|
A method
of Bridge Crane Controlling or reducing speed by friction.
(ASME B30-17)
|
Brake, mechanical load
|
Hoist
|
An automatic
type of friction brake used for Bridge Crane Controlling loads
in a lowering direction. This unidirectional device requires
torque from the motor or hand chain wheel to lower a load but
does not impose any additional load on the motor or hand chain
wheel when lifting a load.
(ASME B30-16-1993)
|
Brake, parking
|
Overhead
Crane
|
A brake for
bridge and trolley that may be automatically or manually applied
to impede horizontal motion by restraining wheel rotation.
(ASME B30-17)
|
Brake, pneumatic
|
Overhead
Crane
|
A method
of Bridge Crane Controlling or powering a drive or brake by
means of compressed gas. (ASME B30-17)
|
Brake, regenerative
|
Hoist
|
A method
of Bridge Crane Controlling speed in which the electrical energy
generated by the motor is fed back into the power system.
(ASME B30-17)
|
Brake, service
|
Overhead
Crane
|
A brake for
bridge or trolley used by the operator, during normal operation,
to apply a retarding force.
(ASME B30.2-1990)
|
Branch circuit
|
Bridge Crane
Control
|
The circuit
conductors between the final overcurrent device protecting the
circuit and the outlet(s). (CMAA Spec. 70)
|
Breakaway force
|
Below Hook
Device
|
The external
force that is required to separate the vacuum pad or vacuum lifting
device from the load when applied perpendicular to the attachment
surface.
(ASME
B30.20-1985)
|
Bridge
|
Overhead
Crane
|
That part
of an overhead crane consisting of girders, trucks, end ties,
walkway and drive mechanism which carries the trolley and travels
in a direction parallel to the
runway. (CMAA Spec. 70)
|
Bridge (crane) travel
|
Overhead
Crane
|
Crane movement
in a direction parallel to the crane runway.
(ASME B30.11-1993)
|
Bridge conductors
|
Overhead
Crane
|
The electrical
conductors located along the bridge structure of a crane to provide
power to the trolley. (CMAA Spec. 70)
|
Bridge crane, top running
|
Overhead
Crane
|
|
Bridge Crane, Under running
|
Overhead
Crane
|
|
Bridge girder (crane girder)
|
Overhead
Crane
|
Crane member
on which carriers or trolleys travel, horizontally mounted between
and supported by the end trucks. Building Structure. The structural
members of a building
which support the building loads and on which the loads of crane
or monorail equipment, and the material to be moved, will be imposed.
(ANSI MH 27.1-1981)
|
Bridge rail
|
Overhead
Crane
|
The rail
supported by the bridge girders on which the trolley travels.
(CMAA Spec. 70)
|
Bridge travel
|
Overhead
Crane
|
The crane
movement in a direction parallel to the crane runway.
(ASME B30.2-1990)
|
Bumper (buffer)
|
Overhead
Crane
|
An energy
absorbing device for reducing impact when a moving crane or
trolley reaches the end of its permitted travel, or when two
moving cranes or trolleys come into
contact. (CMAA Spec. 70)
|
Cab
|
Overhead
Crane
|
The operator’s
compartment on a crane.
(ASME B30-17)
|
Cab Bridge Crane Controlled
|
|
Equipment
Bridge Crane Controlled from an operator’s cab. (ANSI MH 27.1-1981)
|
Cab, normal
|
Overhead
Crane
|
Operator’s
compartment used for Bridge Crane Controlling a cab-operated
crane.
(ASME B30.2-1990)
|
Cab, skeleton
|
Overhead
Crane
|
Operator’s
compartment used for occasional cab operation of, normally,
a floor- or remote-operated crane or carrier.
(ASME B30.11-1993)
|
Cab-operated crane
|
Overhead
Crane
|
A crane Bridge
Crane Controlled by an operator in a cab located on the bridge
or trolley. (CMAA Spec. 70)
|
Camber
|
Overhead
Crane
|
The slight
upward vertical curve given to girders to compensate partially
for deflection due to hook load and weight of the Crane. (CMAA
Spec. 70)
|
Cantilever frame
|
Overhead
Crane
|
A structural
member that supports the trolley of a wall crane.
(ASME B30.2-1990)
|
Capacity
|
General
|
The maximum
rated load (in tons) which a cranes designed. to handle. (CMAA
Spec. 70)
|
Carrier (also known as trolley)
|
Hoist
|
A unit that
travels on the bottom flange of a monorail track, jib boom, or
bridge girder to transport a load.
(ASME B30.11-1993)
|
Carrier (trolley)
|
Overhead
Crane
&
Hoist
|
An assembly
with wheels which will run on monorail track or crane girders
and which will support a load. (ANSI MH 27.1-1981)
|
Carrier head
|
Overhead
Crane
&
Hoist
|
A 2-wheel
assembly used with load bars to form a carrier or end truck.
(ANSI MH 27.1-1981)
|
Ceiling mounted
|
Hoist
|
A type of
hoist mounting where the hoist is mounted to the underside of
a horizontal supporting surface.
(ASME HST-4M-1991)
|
Chain, hand
|
Hoist
|
The chain
grasped by the operator to apply force required for lifting,
lowering, or traveling motions.
(ASME B30-17)
|
Chain, load
|
Hoist
|
The load-bearing
chain in a hoist.
(ASME B30-17)
|
Chain, roller
|
Hoist
|
A series
of alternately assembled roller links and pin links in which
the pins articulate inside the bushings and the rollers are free
to turn on the bushings. Pins and bushings are press fit in their
respective link plates. .
(ASME B30-16-1993)
|
Chain, welded link
|
Hoist
|
A chain consisting
of a series of interwoven links fanned and welded.
(ASME B30-16-1993)
|
Circuit breaker
|
Bridge Crane
Electrical
|
A device
to open and close a circuit by non-automatic means, and to open
the circuit automatically on a predetermined overload of current,
without injury to itself when
properly applied within its rating. (ANSI MH 27.1-1981)
|
Clamp
|
Monorail
|
A type of
suspension fitting used to support tracks from an overhead structure
fastened to the structure by means of pressure rather than welding
or direct bolting. (ANSI MH
27.1-1981)
|
Clearance
|
General
|
Minimum distance
from the extremity of a crane to the nearest obstruction. (CMAA
Spec. 70)
|
CMAA
|
Overhead
Crane
|
Crane Manufacturers
Association of America, Inc. (formerly EQOI—Electric Overhead
Crane Institute). (CMAA Spec. 70)
|
Cold current
|
Below hook
device
|
The current
drawn by the magnet when its coil is at 680F (200C)
and at rated voltage.
(ASME B30.20-1985)
|
Cold current
|
Below hook
device
|
That current
drawn by the magnet when its coil is at 680F (200C)
and at rated voltage.
(ASME B30.20-1985)
|
Collector, shoe
|
Bridge Crane
Electrical
|
The portion
of a collector which makes contact by sliding on the conductor
bar. (ANSI MH 27.1-1981)
|
Collector, wheel
|
Bridge Crane
Electrical
|
The portion
of a collector which makes contact by rolling on the conductor
bar. (ANSI MH 27.1-1981)
|
Collectors
|
Bridge Crane
Electrical
|
Contacting
devices for collecting current from the runway or bridge conductors.
The mainline collectors are mounted on the bridge to transmit
current from the runway conductors, and the trolley collectors
are mounted on the trolley to transmit current from the bridge
conductors. (CMAA Spec. 70)
|
Collectors
|
Bridge Crane
Electrical
|
Electrical
contacting devices providing a path for current flow from stationary
conductors to moving equipment. (ANSI MH 27.1-1981)
|
Collectors, current
|
Bridge Crane
Electrical
|
Contacting
devices for collecting current from runway or bridge conductors. (ASME
B30.2-1990)
|
Conductors, bridge
|
Overhead
Crane
|
The electrical
conductors located along the bridge girder(s) to provide power
and Bridge Crane Control circuits to the trolley. (Sometimes
incorrectly called trolley conductors). (WCH)
|
Conductors, enclosed
|
Bridge Crane
Electrical
|
A bar used
to transmit an electrical current, enclosed in a non-conducting
material to minimize accidental contact with the conductor. (ANSI
MH 27.1-1981)
|
Conductors, open
|
Bridge Crane
Electrical
|
A bar used
to transmit an electrical current. (ANSI MH 27.1-1981)
|
Conductors, runway (main)
|
Bridge Crane
Electrical
|
The electrical
conductors located along a crane runway that transmit Bridge
Crane Control signals and power to the crane.
(ASME B30-17)
|
Contactor
|
Bridge Crane
Electrical
|
An electromechanical
device for opening and closing an electric power circuit. (ASME
HST-4M-1991)
|
Contactor, magnetic
|
Bridge Crane
Control
|
An electro-magnetic
device for opening and closing an electric power circuit. (CMAA
Spec. 70)
|
Bridge Crane Control actuator
|
Bridge Crane
Electrical
|
A manual
means at the operating station by which hoist Bridge Crane Controls
are energized.
(ASME HST-4M-1991)
|
Bridge Crane Control braking means
|
Overhead
Crane
&
Hoist
|
A method
of Bridge Crane Controlling speed by removing energy from the
moving body or by imparting energy in the opposite direction.
(ASME HST-4M-1991)
|
Bridge Crane Control enclosure
|
Bridge Crane
Electrical
|
The housing
containing the electrical Bridge Crane Control component.
(ASME HST-4M-1991)
|
Bridge Crane Control panel
|
Bridge Crane
Electrical
|
See Bridge
Crane Control enclosure.
|
Bridge Crane Control voltage.
|
Bridge Crane
Electrical
|
The voltage
impressed on the Bridge Crane Control devices. (ANSI MH 27.1-1981)
|
Bridge Crane Control, multi-speed
|
Bridge Crane
Electrical
|
A drive Bridge
Crane Control system providing more than one speed operation
in either direction using multi-speed squirrel cage. motors.
(ANSI MH 27.1-1981)
|
Bridge Crane Control, single speed
|
Bridge Crane
Electrical
|
A drive Bridge
Crane Control system providing one speed operation in either
direction. (ANSI MH 27.1-1981)
|
Bridge Crane Control, variable speed
|
Bridge Crane
Electrical
|
A drive Bridge
Crane Control system providing more than one speed operation
in either direction using wound-rotor motors.
|
Bridge Crane Controller
|
Bridge Crane
Control
|
A device
for regulating in a pre-determined way the power delivered to
the motor or other equipment. (CMAA Spec. 70)
|
Bridge Crane Controller, manual
|
Bridge Crane
Control
|
A Bridge
Crane Controller having all of its basic functions performed
by devices which are operated by hand.
(ASME B30-17)
|
Bridge Crane Controller, spring return
|
Bridge Crane
Control
|
A Bridge
Crane Controller that, when released, will return automatically
to a neutral (off) positioning, static, hydraulic, pneumatic,
etc.) that governs the flow of power to or from a motor or other
equipment in response to signals from a master switch, push-button
station, remote Bridge Crane Control, automatic program Bridge
Crane Control, or other similar device.
(ASME B30.2-1990)
|
Countertorque
|
Bridge Crane
Control
|
A method
of Bridge Crane Controlling speed by applying a variable motor
torque in the direction opposite to the direction that the motor
is rotating due to being overhauled by the
load.
(ASME HST-4M-1991)
|
Couplings (splices)
|
|
Mechanical
devices used to join the adjacent ends of track sections. (ANSI
MH 27.1-1981)
|
Cover plate
|
Overhead
Crane
|
The top or
bottom plate of a box girder. (CMAA Spec. 70)
|
Crane
|
|
A machine
for lifting, lowering, and moving a load with the hoisting mechanism
a part of the machine. Cranes may be traveling, portable, or
fixed type.
Traveling
Cranes. Cranes that follow a fixed path
Underhung
Crane. A traveling crane with a movable bridge running on the
lower flanges of an overhead fixed runway structure and carrying
a movable or fixed hoisting mechanism. (ANSI MH 27.1-1981)
|
Crane girder
|
Bridge Crane
|
See Bridge
Girder. (ANSI MH 27.1-1981)
|
Crane service, heavy
|
Bridge Crane
|
Service that
involves operating at 85 to 100% of rated load or in excess of
10 lift cycles/hr as a regular specified procedure.
(ASME B30.2-1990)
|
Crane service, normal
|
Bridge Crane
|
Service that
involves operating at less than 85% of rated load and not more
than 10 lift cycles/hr except for isolated instances.
(ASME B30.2-1990)
|
Crane service, normal
|
Bridge Crane
|
That service
which involves operation with randomly distributed loads within
the rated load limit, or with uniform loads of less than 65%
of the rated load, for no more than
15% of the time of a single work shift for manually operated cranes
and 25% of the time of a single work shift for electrically or
pneumatically powered cranes.
(ASME B30-17)
|
Crane service, severe
|
Bridge Crane
|
Service that
involves normal or heavy service with abnormal operating conditions. (ASME
B30.2-1990)
|
Crane, automatic
|
Bridge Crane
|
A crane which
when activated operates through a preset cycle or cycles.
(ASME B30-17)
|
Crane, cab-operated
|
Bridge Crane
|
A crane Bridge
Crane Controlled by an operator in a cab attached to the bridge
or trolley (refer to Fig. 1). (ASME B30-17)
|
Crane, cantilever gantry
|
Bridge Crane
|
A gantry
or semigantry crane in which the bridge girders or trusses extend
transversely beyond the crane runway on one or both sides (refer
to Fig. 2). (ASME B30-17)
|
Crane, floor-operated
|
Bridge Crane
|
A crane that
is Bridge Crane Controlled by a means suspended from the crane,
operated by a person on the floor or on an independent platform
(refer to Fig. 3) (ASME B30-17)
|
Crane, gantry
|
Bridge Crane
|
A crane similar
to an overhead crane, except that the bridge for carrying the
trolley or trolleys is rigidly supported on two or more legs
running on fixed rails or other
runway (refer to Fig. 4). (ASME B30-17)
|
Crane, hot molten material-handling
|
Bridge Crane
|
An overhead
crane used for transporting or pouring molten material. (ASME
B30-17)
|
Crane, manually operated
|
Bridge Crane
|
A crane whose
hoist mechanism is driven by pulling an endless chain, or whose
travel mechanism is driven in the same manner or by manually
moving the load or hook.
(ASME B30.2-1990)
|
Crane, outdoor storage gantry
|
Bridge Crane
|
A gantry-type
crane of long span usually used for storage of bulk material
such as ore, coal, or other similar items; the bridge girders
or trusses are rigidly or nonrigidly
supported on one or more legs. It may have one or more fixed or
hinged cantilever ends. .
(ASME B30.2-1990)
|
Crane, overhead
|
Bridge Crane
|
A crane with
a single or multiple girder movable bridge crane a movable or
fixed hoisting mechanism and traveling on an overhead fixed runway
structure.
(ASME
B30.2-1990)
|
Crane, polar
|
Bridge Crane
|
An overhead
or gantry crane that travels on a circular runway.
(ASME B30.2-1990)
|
Crane, pulpit-operated
|
Bridge Crane
|
A crane operated
from a fixed operator station not attached to the crane. (ASME
B30-17)
|
Crane, remote-operated
|
Bridge Crane
|
A crane Bridge
Crane Controlled by an operator who is not in a pulpit or in
a cab attached to the crane, by any method other than a means
suspended from the crane. (ASME B30-17)
|
Crane, semi-gantry
|
Bridge Crane
|
A gantry
with one end of the bridge rigidly supported on one or more legs
that run on a fixed rail or runway, the other end of the bridge
being supported by an end truck
running on an elevated rail or runway.
(ASME B30.2-1990)
|
Crane, single-girder
|
Bridge Crane
|
A crane having
one bridge girder mounted between, and supported from, the end
trucks.
(ASME B30.11-1993)
|
Crane, standby
|
Bridge Crane
|
A crane which
is not in regular service but which is used occasionally or intermittently
as required.
(ASME B30-17)
|
Crane, wall
|
Bridge Crane
|
A crane having
a cantilever frame with or without trolley, and supported from
a side wall or line of columns of a building. It is a traveling
type and operates on a runway attached to the side wall or columns.
(ASME B30.2-1990)
|
Cranes, fixed
|
Bridge Crane
|
Cranes which
are non-mobile. Derricks and jib cranes are classified as fixed
cranes. (ANSI MH 27.1-1981)
|
Cranes, portable
|
Bridge Crane
|
Cranes having
a revolving superstructure with power plant, operating machinery
and boom mounted on a fully mobile carriage not confined to a
fixed path. Crawler, locomotive and truck cranes are classified
as portable cranes.
|
Creep speed
|
Bridge Crane
Control
|
A very slow,
constant, continuous, fixed rate of motion of the hoist, trolley,
or bridge: usually established at 1% to 10% of the normal full
load speed. (WCH)
|
Cross shaft
|
Crane
|
The shaft
extending across the bridge, used to transmit torque from motor
to bridge drive wheels. (CMAA Spec. 70)
|
Crossover. (fixed transfer section)
|
Monorail
|
A connecting
track with an interlock mechanism on both ends, mounted between
two interlocking cranes, used to transfer a carrier from one
bridge to the other. (ANSI MH 27.1-1981)
|
Crosstrack switch
|
Monarail
|
A track switch
containing one straight section of moving track pivoted in the
center which can be rotated to align it with other crossing tracks
to allow passage of a carrier through the junction without changing
the direction of the carrier motion. (ANSI MH 27.1-1981)
|
Curves
|
Monorail
|
Formed sections
of monorail track used to change the horizontal or vertical direction
of carrier travel. (ANSI MH 27.1-1981)
|
Cushioned start
|
Bridge Crane
Control
|
An electrical
or mechanical method for reducing the rate of acceleration of
a travel motion. (CMAA Spec. 70)
|
Cushioned start
|
Bridge Crane
Control
|
An electrical
or mechanical method for reducing the rate of acceleration of
trolley motion.
(ASME HST-4M-1991)
|
Dead loads
|
General
|
The loads
on a structure which remain in a fixed position relative to the
structure. On a crane bridge such loads include the girders,
footwalk, cross shaft, drive units, panels, etc. (CMAA Spec.
70)
|
Deflection
|
Bridge Crane
|
Displacement
due to bending or twisting in a vertical or lateral plane, caused
by the imposed live and dead loads. (CMAA Spec. 70)
|
Designated
|
Regulatory
|
Selected
or assigned by the employer or the employer’s representative
as being competent to perform specific duties.
(ASME B30.2-1990)
|
Diaphragm
|
Bridge Crane
|
A plate or
partition between opposite parts of a member, serving a definite
purpose in the structural design of the member. (CMAA Spec. 70)
|
Disconnecting means
|
Bridge Crane
Electrical
|
A device,
or group of devices, or other means whereby the conductors of
a circuit can be disconnected from their power source. (ANSI
MH 27.1-1981)
|
Double girder crane
|
Bridge Crane
|
A .crane
having two bridge girders mounted between and supported from
the end trucks. (ANSI MH 27.1-1981)
|
Drift point
|
Bridge Crane
&
Hoist
|
A point on
a travel motion master switch or on a manual Bridge Crane Controller
that maintains the brake released while the motor is not energized.
This allows for coasting.
(ASME B30.2-1990)
|
Drive girder
|
Bridge Crane
|
The girder
on which the bridge drive machinery is mounted. (CMAA Spec. 70)
|
Driving head.
|
Bridge Crane
&
Monorail
|
A motordriven
carrier head which is supported from and propelled by the load
bearing wheels. (ANSI MH 27.1-1981)
|
Drop section (also known as lift section)
|
Monorail
|
A mechanism
that will permit a section of track(s) to be lifted or lowered
out of alignment with the stationary track(s).
(ASME B30.11-1993)
|
Drum
|
Hoist
|
The cylindrical
member around which rope is wound for lifting or lowering the
load.
(ASME B30-16-1993)
|
Dummy cab
|
Bridge Crane
|
An operator’s
compartment or platform on a pendant or radio Bridge Crane Controlled
crane, having no permanently-mounted electrical Bridge Crane
Controls, in which an operator may ride while
Bridge Crane Controlling the crane. (CMAA Spec. 70)
|
Dynamic
|
Bridge Crane
Control
|
A method
of Bridge Crane Controlling speed by using the motor as a generator,
with the energy being dissipated by resistance.
(ASME HST-4M-1991)
|
Dynamic lowering
|
Hoist
|
A method
of Bridge Crane Control by which the hoist motor is so connected
in the lowering direction, that when it is over-hauled by the
load, it acts as a generator and forces current either through
the resistors or back into the line. (CMAA Spec. 70)
|
Eddy current
|
Bridge Crane
Control
|
See eddy
current braking
|
Eddy-current braking
|
Bridge Crane
Control
|
A method
of Bridge Crane Control by which the motor drives through an
electrical induction load brake. (CMAA Spec. 70)
|
Electric baffle
|
Bridge Crane
Electrical
|
Conductors
that are wired to cut off electric power to approaching motor-driven
equipment if track switches, drop sections, and other movable
track devices are not properly set for passage of equipment.
(ASME B30.11-1993)
|
Electric overhead traveling crane
|
Bridge Crane
|
An electrically
operated machine for lifting, lowering and transporting loads,
consisting of a movable bridge carrying a fixed or movable hoisting
mechanism and traveling on an overhead runway structure. (CMAA
Spec. 70)
|
Electrical braking system
|
Hoist
|
A method
of Bridge Crane Controlling crane motor speed when in an overhauling
condition, without the use of friction braking. (CMAA Spec. 70)
|
Electrically interlocked
|
Bridge Crane
Control
|
An electrical
device in the starter circuit which prevents a short circuit
when opposite Bridge Crane Controls are operated at the same
time. (ANSI MH 27.1-1981)
|
Electrification.
|
Bridge Crane
Electrical
|
The track
mounted conductor system by which the moving equipment receives
its electrical power. (ANSI MH 27.1-1981)
|
Enclosed conductor
|
Bridge Crane
Electrical
|
A conductor
or group of conductors substantially enclosed to prevent accidental
contact. (CMAA Spec. 70)
|
Enclosure
|
Bridge Crane
Electrical
|
A housing
to contain electrical components, usually specified by a NEMA
classification number. (CMAA Spec. 70)
|
End approach
|
Bridge Crane
|
The minimum
horizontal distance, parallel to the runway, between the outermost
extremities of the crane and the centerline of the hook. (CMAA
Spec. 70)
|
End stop
|
Bridge Crane
&
Runway
|
A device
to limit travel of a trolley or crane bridge. This device normally
is attached to a fixed structure and normally does not have
energy absorbing ability. (CMAA Spec.
70)
|
End tie
|
Bridge Crane
|
A structural
member other than the end truck which connects the ends of the
girders to maintain the squareness of the bridge. (CMAA Spec.
70)
|
End truck
|
Bridge Crane
|
An assembly
consisting of the frame and wheels which support the crane girder(s)
and allow movement along the runway.
(ASME B30.11-1993)
|
End truck loa
|
Bridge Crane
|
|
Equalizer
|
Hoist
|
A device
which compensates for unequal length or stretch of a rope or
chain.
(ASME B30-16-1993)
|
Exposed
|
Bridge Crane
Electrical
|
Applies to
hazardous objects not guarded or isolated (capable of being contacted
inadvertently). (ASME B30-17)
|